NJ2320M Single-Row Cylindrical Roller Bearing Overview
The NJ2320M (also specified in customer inquiries and OEM parts lists as NJ2320ECMC3, NJ 2320 ECM/C3, NJ 2320 ECML/C3, NJ2320-E-XL-M1-C3) is a heavy-duty single-row cylindrical roller bearing in the ISO NJ23 dimension series with boundary dimensions of 100 mm × 215 mm × 73 mm (100×215×73 mm), raceway envelope diameter Fw = 129.5 mm, and a catalog reference mass of 13.5 kg. Featuring two integral outer-ring ribs, one integral inner-ring rib (NJ design), and a heavy-duty machined brass cage (M / EM), it delivers a basic dynamic load rating of 440 kN and a basic static load rating of 630 kN.
ZQM Bearings supplies the NJ2320M cylindrical roller bearing in both standard normal radial clearance (C0) and C3 radial internal clearance (matching NJ2320ECMC3 requirements) for global distributors, gearbox OEMs, and industrial MRO buyers.
| Core Attribute | Specification | Engineering Note |
|---|---|---|
| Controlled Model | NJ2320M (NJ2320M) | Covers inquiry code NJ2320ECMC3 (EM/M brass cage + C3 clearance) |
| Bearing Type | Single-Row Cylindrical Roller Bearing (NJ Design) | Separable inner ring; supports heavy radial load & unidirectional axial location |
| Boundary Dimensions (d × D × B) | 100 mm × 215 mm × 73 mm (Fw = 129.5 mm) | ISO 15 / DIN 5412-1 metric dimension series NJ23 |
| Load Ratings & Mass | Cr = 440 kN · C0r = 630 kN · Mass = 13.5 kg | Verified against ZQM controlled engineering database |
NJ2320M Technical Specifications (100×215×73 mm)
The following dimensional, load rating, speed, and abutment parameters are dynamically synchronized with the ZQM Bearings controlled engineering database to ensure 100% consistency with our online catalog:
Data source: ZQM Bearings controlled model database. Verify shaft/housing fits (da, db, Da), internal clearance and drawing requirements before ordering.NJ2320M Technical Specifications & Dimensions
Parameter Category Technical Parameter (Symbol) Catalogue Value Boundary Dimensions & Weight Bore diameter (d) 100 mm Boundary Dimensions & Weight Outside diameter (D) 215 mm Boundary Dimensions & Weight Width (B) 73 mm Boundary Dimensions & Weight Roller set under-raceway diameter (Fw) 129.5 mm Boundary Dimensions & Weight Reference mass (Weight) (mass) 13.5 kg Load Ratings & Limiting Speeds Basic dynamic load rating (Cr) 440 kN Load Ratings & Limiting Speeds Basic static load rating (Cor) 630 kN Load Ratings & Limiting Speeds Limiting speed (grease) (grease) 2400 rpm Load Ratings & Limiting Speeds Limiting speed (oil) (oil) 3000 rpm Abutment & Fillet Dimensions Shaft abutment diameter (db) 116 mm Abutment & Fillet Dimensions Housing abutment diameter (Da) 197 mm Abutment & Fillet Dimensions Minimum chamfer dimension (r12) 3 mm Abutment & Fillet Dimensions Minimum flange chamfer (r34) 3 mm Abutment & Fillet Dimensions Maximum fillet radius (ra) 2.5 mm Abutment & Fillet Dimensions Maximum flange fillet radius (rb) 2.5 mm
Designation Breakdown & Structural Features (NJ2320M / NJ2320ECMC3)
Understanding the suffix nomenclature between standard catalog code NJ2320M and customer inquiry code NJ2320ECMC3 ensures accurate technical interchangeability:
| Code Segment | Structural Meaning | Application & Interchange Impact |
|---|---|---|
NJ |
Two integral ribs on outer ring, one integral rib on inner ring | Locates shaft axially in one direction while permitting separable mounting |
2320 |
ISO Dimension Series NJ23 · Bore d = 100 mm | Bore code × 5 = 100 mm nominal bore diameter |
E / EM / M |
Reinforced roller complement (E) + Machined brass cage (M) | Equivalent in load and cage metallurgy to SKF ECM / ECML and FAG E-XL-M1 |
C3 (on inquiry NJ2320ECMC3) |
Radial internal clearance greater than Normal (C0) | Prevents preload under heavy interference fits and high-speed thermal gradients |
Typical Industrial Applications & Operating Conditions
With a dynamic load rating of 440 kN and static load rating of 630 kN, the NJ2320M (100×215×73 mm) is widely deployed across heavy industrial power transmission and rotating equipment:
| Industry Sector | Typical Equipment & Position | Operating Load Profile |
|---|---|---|
| Industrial Gearboxes & Reducers | Intermediate and output shafts requiring high radial stiffness and axial displacement compensation at the non-locating position, or one-direction axial location against the inner ring rib. | Heavy radial load, high radial stiffness & thermal axial float |
| Traction Motors & Heavy Electric Generators | Drive-end and non-drive-end rotor support operating under heavy radial belt or gear loads and continuous thermal expansion cycles. | Heavy radial load, high radial stiffness & thermal axial float |
| Mining & Cement Processing Machinery | Crusher countershafts, ball mill pinion drives, and heavy conveyor pulleys exposed to shock loads and continuous operation. | Heavy radial load, high radial stiffness & thermal axial float |
| Metallurgical & Paper Mill Drives | Rolling mill auxiliary drives, calendar rolls, and high-torque industrial pumps requiring machined brass cage reliability. | Heavy radial load, high radial stiffness & thermal axial float |
Clearance, Cage & Bore Configuration Options
When ordering NJ2320M or matching an RFQ for NJ2320ECMC3, confirm the following configuration parameters prior to dispatch:
| Configuration Item | Available Options | Selection Guidance |
|---|---|---|
| Radial Internal Clearance | C0 (Normal) · C3 · C4 |
Specify C3 when matching NJ2320ECMC3 or when mounting with heavy shaft interference fits |
| Cage Design | M / EM (Machined Brass) · ECP (Polyamide) |
Machined brass cage provides superior mechanical strength under shock, vibration, and high acceleration |
| Bore & Groove | Cylindrical Bore · Standard NJ Rib Geometry | Verify shaft fillet radius ra ≤ 2.5 mm and shoulder diameter db ≥ 116 mm |
Brand Cross-Reference & Interchangeability (NJ2320M / NJ2320ECMC3)
All brands listed below share identical ISO 15 boundary dimensions (100 mm × 215 mm × 73 mm), while suffix letters vary by manufacturer internal design and cage/clearance code:
| Brand / Standard | Equivalent Designation | Design & Suffix Notes |
|---|---|---|
| ZQM Bearings | NJ2320M / NJ2320M C3 | Machined brass cage; available in C0 or C3 clearance |
| Customer Inquiry Code | NJ2320ECMC3 | Direct dimensional interchange (100×215×73 mm); C3 radial clearance |
| SKF | NJ 2320 ECML/C3 / NJ 2320 ECM/C3 (NJ2320ECMC3) | SKF Explorer series equivalent |
| FAG / Schaeffler | NJ2320-E-XL-M1-C3 / NJ2320-E-M1 | X-life / standard machined brass cage design |
| NSK | NJ2320EM / NJ2320M C3 | High-capacity machined brass cage specification |
| NTN | NJ2320EG1C3 / NJ2320E | Heavy-duty industrial specification |
| Timken | NJ2320EMA | Brass cage heavy industrial series |
Procurement & Pre-Order Verification Checklist
To receive a fast, accurate quotation from ZQM Bearings for NJ2320M (or NJ2320ECMC3), please include the following details in your inquiry:
| Verification Item | Required Information | Why It Matters |
|---|---|---|
| 1. Exact Designation & Suffix | State NJ2320M or NJ2320ECMC3 (confirm C0 vs. C3 clearance) |
Ensures internal radial clearance and cage type match your operating temperature and fit |
| 2. Order Quantity & Usage | Batch quantity (e.g., trial order, MRO replacement, or scheduled OEM delivery) | Allows us to allocate production/stock batches and optimize export crate packaging (unit mass: 13.5 kg) |
| 3. Inspection & Documentation | Dimensional inspection report, material certificate, or clearance test sheet | Available upon request prior to shipment for quality verification |
| 4. Destination & Incoterms | Target port/country and preferred terms (EXW, FOB, CIF, or air/express freight) | Enables accurate freight calculation and lead-time confirmation |
Frequently Asked Questions (NJ2320M / NJ2320ECMC3)
Q1: Can ZQM NJ2320M replace NJ2320ECMC3 directly?
Yes. Both share the exact ISO boundary dimensions of 100 mm × 215 mm × 73 mm. When your inquiry or equipment manual specifies NJ2320ECMC3, simply request NJ2320M with C3 radial clearance (machined brass cage M/EM matches SKF ECM) so both mounting dimensions and internal operating clearance are 100% matched.
Q2: What are the exact mounting shoulder and fillet dimensions for NJ2320M?
According to our controlled engineering database, the minimum chamfer dimension r1,2 min is 3 mm, maximum shaft/housing fillet radius ra max is 2.5 mm, minimum shaft abutment diameter db min is 116 mm, and maximum housing abutment diameter Da max is 197 mm.
Q3: What is the unit weight of NJ2320M for freight calculation?
The catalog reference mass of a single NJ2320M bearing is 13.5 kg (excluding export wooden case or pallet weight).
[zqm_related_models limit=”10″]
